[admin@misc01 .ssh]$ mysqldump world -uroot -ppassword | gzip | ssh migration@xxx.xxx.xxx.xxx -i authorized_keys 'cat > /home/migration/mysqldump.sql.gz'
mysqldump: [Warning] Using a password on the command line interface can be insecure.
Warning: A partial dump from a server that has GTIDs will by default include the GTIDs of all transactions, even those that changed
suppressed parts of the database. If you don't want to restore GTIDs, pass --set-gtid-purged=OFF. To make a complete dump, pass --al
l-databases --triggers --routines --events.
Enter passphrase for key 'authorized_keys':
[admin@misc01 .ssh]$

In the event the primary member is removed from the group, then an election is performed and a new primary is chosen from the remaining servers in the group. This election is performed by looking at the new view, ordering the server UUIDs in lexicographical order and by picking the first one.

ALTER TABLE Changes:
NDB Cluster formerly supported an alternative syntax for online ALTER TABLE.
This is no longer supported in NDB Cluster 7.5, which makes exclusive use of
ALGORITHM = DEFAULT|COPY|INPLACE for table DDL, as in the standard MySQL Server.

[oracle@study01-mysql-1 ~]$ ./mysqlslap.sh
Benchmark
Running for engine InnoDB
Average number of seconds to run all queries: 38.711 seconds
Minimum number of seconds to run all queries: 38.711 seconds
Maximum number of seconds to run all queries: 38.711 seconds
Number of clients running queries: 10
Average number of queries per client: 10000
[oracle@study01-mysql-1 ~]$

[oracle@study01-mysql-1 ~]$ ./mysqlslap.sh
Benchmark
Running for engine InnoDB
Average number of seconds to run all queries: 38.466 seconds
Minimum number of seconds to run all queries: 38.466 seconds
Maximum number of seconds to run all queries: 38.466 seconds
Number of clients running queries: 10
Average number of queries per client: 10000
[oracle@study01-mysql-1 ~]$

[oracle@study01-mysql-1 ~]$ ./mysqlslap.sh
Benchmark
Running for engine InnoDB
Average number of seconds to run all queries: 185.845 seconds
Minimum number of seconds to run all queries: 185.845 seconds
Maximum number of seconds to run all queries: 185.845 seconds
Number of clients running queries: 10
Average number of queries per client: 50000
[oracle@study01-mysql-1 ~]$

SQL statements produce diagnostic information that populates the diagnostics area. Standard SQL has a diagnostics area stack, containing a diagnostics area for each nested execution context. Standard SQL also supports GET STACKED DIAGNOSTICS syntax for referring to the second diagnostics area during condition handler execution. MySQL supports the STACKED keyword as of MySQL 5.7. Before that, MySQL does not support STACKED; there is a single diagnostics area containing information from the most recent statement that wrote to it.
標準SQLは条件ハンドラの実行中に、第2の診断領域を参照するためのSTACKED診断構文をGETサポートしています。

■ GET CURRENTの挙動
The GET DIAGNOSTICS statement is typically used in a handler within a stored program.
It is a MySQL extension that GET [CURRENT] DIAGNOSTICS is permitted outside handler context to check the execution of any SQL statement.

■ GET STACKEDの挙動
The GET DIAGNOSTICS statement is typically used in a handler within a stored program.
It is a MySQL extension that GET [CURRENT] DIAGNOSTICS is permitted outside handler context to check the execution of any SQL statement.
プロシジャー外部での利用の為、エラーになっています。

抜粋：
READ_BACKUP: Setting this option to 1 has the same effect as though ndb_read_backup were enabled; enables reading from any replica.
Setting this option to 1 automatically sets FRAGMENT_COUNT_TYPE to ONE_PER_LDM_PER_NODE_GROUP (see next item).
Starting with MySQL Cluster NDB 7.5.3, you can set READ_BACKUP for an existing table online,
using an ALTER TABLE statement similar to one of those shown here: